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Chapter 12.
SINGLE G.703
(E3/T3/STS-1) INTERFACE (CDI-10-1)
12.1
Introduction
The CDI-10-1 Single E3/T3/STS-1 Data Interface (Figure 12-1) is a plug-in module that is
installed into the rear of the CDM-710G High-Speed Satellite Modem chassis. It provides physical
and electrical connection between the external terrestrial device and the internal circuitry of the
modulator or demodulator.
Figure 12-1. CDI-10-1 Single G.703 (E3/T3/STS-1) Data Interface Module
By convention, a modem is Data Communications Equipment (DCE) where Tx data enters the data
interface and Rx data exits. The plug-in interface has full duplex capability. In addition, the module
is automatically configured for simplex-transmit or simplex-receive operation when the module is
plugged into a simplex chassis configured for 'modulator only' or 'demodulator only' operation.
Slot 1 of the CDM-710G – located at the center right of the chassis rear panel – is filled with a data
interface module first; Slot 2 – located at the right side end of the chassis rear panel – is assigned a
blank panel or a CDI-70 10/100/1000 Base-T Gigabit Ethernet interface, depending upon
configurations allowed at time of order.
12–1
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